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Reading register AD7176-2 ?

Question asked by Val on Jul 23, 2013
Latest reply on Jul 24, 2013 by Val

Hi,

I have a problem with the SPI communication on AD7176-2.

I'm able to write in the registers respecting the clock format given by the datasheet, however I can't read any data from it.

The SPI communication works with a quadrature counter on the same board so I think it's a problem with the protocole of communication with the ADC.

I added pull up resistors without any effect.

Changing frequency didn't give a better result.

I've tried to read and/or write in the different ADC mode, setup all the configuration for one channel, add delay between the write command and the answer, more delay for the chip select.

If you could please help with this problem.

 

The following clock format show a try of reading the ID of ADC.

CS : Blue

Clock : Yellow

DIN/MOSI : Pink

DOUT/MISO : Green

all.BMP

clk_in_out.BMP

The ADC seems to answer to right only the first bit of the ID, 0x0C9X

You can observe some glitches which appear only during the reading

glitch.BMP

Thank you

Val

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